Tuning With A Known Direction Of Frequency Movement - MFJ Super Hi-Q Loop -1786 Instruction Manual

MFJ Super Hi-Q Loop™ Antenna
3.) Press the AUTO BAND SELECT "DOWN" button. The yellow FREQ "DOWN" LED should
light.
4.) The control box should beep and the yellow FREQ "DOWN" LED should go out after the
operating frequency range is found. Release the Auto Band Select "DOWN" button and a red or
green MOVE "UP" or "DOWN" LED should light.
Note: If the transmitter power is suddenly changed or removed the control system will stop the
loop tuning at the wrong spot.
5.) Watch the reflected power needle carefully while you press or "tap" the FINE TUNING button
next to the lit LED. This adjustment is very sharp and you may pass the lowest SWR point
slightly.
6.) "Tap" the other "FINE TUNE" button until the reflected power is as low as possible.
You are now done tuning the loop. Any small changes in frequency can be handled by using the
FINE TUNE buttons.

TUNING WITH A KNOWN DIRECTION OF FREQUENCY MOVEMENT

This method of tuning should be used when you know what direction the antenna needs to move. If the
change is small then only the FINE TUNE buttons need to be used (goto step 4).
1.) Adjust the transmitter to the new frequency and transmit a steady, unmodulated carrier (1-50w is
ideal). Be sure the RANGE switch is set correctly for the power level applied.
2.) Press the appropriate AUTO BAND SELECT button in and observe the yellow "FREQ" LED
closest to the button pressed. The LED should light while the loop is searching for the new
frequency.
3.) After the reflected power goes through a dip the beeper should sound and the "FREQ" LED will
turn off. Release the AUTO BAND SELECT button.
4.) Press or tap the appropriate FINE TUNE button now while carefully watching the wattmeter's
reflected power needle for the lowest reading. BE ALERT. This dip is very sharp.
After the lowest SWR point is reached you are ready to begin operation.
Instruction Manual
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